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<p>This study establishes a crucial post-operational radiological baseline for the Lungluan Wetland (LLW), a critical ecosystem near the Maanshan Nuclear Power Plant (NPP) in Taiwan, ahead of its 2025 decommissioning. Analysis of fifty sediment samples confirmed the absence of anthropogenic contamination (no detectable <sup>137</sup>Cs). The activities of natural radionuclides were comparable to global medians for <sup>40</sup>K (range: 125.7–652.3&#xa0;Bq/kg) and <sup>232</sup>Th (9.9–58.7&#xa0;Bq/kg), while <sup>226</sup>Ra (7.9–33.4&#xa0;Bq/kg) was lower than the Asian wetland median. Although all radiological hazard indices were well below safety limits, the spatial distribution of radionuclides was highly heterogeneous. Higher concentrations were strongly correlated with fine-grained sediments (clay) and high organic matter content, predominantly in low-velocity depositional zones. These findings demonstrate that sediment characteristics and wetland hydrodynamics are the primary drivers of radionuclide distribution. This research provides an essential benchmark for assessing environmental changes during the NPP decommissioning and shows that sediment properties can serve as effective indicators for identifying potential accumulation hotspots, thereby optimizing future monitoring strategies.</p>

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Sediment characteristics affecting natural radionuclide distribution and radiological assessment in a tropical wetland near Maanshan Nuclear Power Plant, Southern Taiwan

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Ting-Chien Chen,
  • Yi-Lung Yeh,
  • Fan-Cheng Zeng,
  • Chih-Chung Lin,
  • Zhi-Mou Chen,
  • Wei-Hsiang Huang

摘要

This study establishes a crucial post-operational radiological baseline for the Lungluan Wetland (LLW), a critical ecosystem near the Maanshan Nuclear Power Plant (NPP) in Taiwan, ahead of its 2025 decommissioning. Analysis of fifty sediment samples confirmed the absence of anthropogenic contamination (no detectable 137Cs). The activities of natural radionuclides were comparable to global medians for 40K (range: 125.7–652.3 Bq/kg) and 232Th (9.9–58.7 Bq/kg), while 226Ra (7.9–33.4 Bq/kg) was lower than the Asian wetland median. Although all radiological hazard indices were well below safety limits, the spatial distribution of radionuclides was highly heterogeneous. Higher concentrations were strongly correlated with fine-grained sediments (clay) and high organic matter content, predominantly in low-velocity depositional zones. These findings demonstrate that sediment characteristics and wetland hydrodynamics are the primary drivers of radionuclide distribution. This research provides an essential benchmark for assessing environmental changes during the NPP decommissioning and shows that sediment properties can serve as effective indicators for identifying potential accumulation hotspots, thereby optimizing future monitoring strategies.